Poll: Warren over Brown, 48-44

Democratic challenger Elizabeth Warren holds a 4-point lead over Scott Brown in the high-stakes Massachusetts Senate race, but the contest is still within the margin of error, according to a Suffolk University/7News poll out Monday night.

Warren was backed by 48 percent of those surveyed, while Brown received 44 percent. Eight percent of people polled were undecided or opted for another candidate.

Over the weekend, the Western New England University Polling Institute found Warren leading Brown, 50 percent to 44 percent, while the left-leaning Public Policy Polling firm found this week Warren to be up over Brown, 48 percent to 46 percent. The Harvard Law School professor gave a prime-time address at the Democratic National Convention earlier this month and she has launched an aggressive new ad buy.

The survey of 600 likely Massachusetts general election voters was conducted Sept. 13-16 and has a margin of error of plus-or-minus 4 percent.